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DevX: PostgreSQL vs. MySQL vs. Commercial Databases: It's All About What You Need

"The database server is a fixture in almost every business these
days. The common commercial databases, such as Oracle, Microsoft's
SQL Server, and IBM's DB2 server, include many features that people
have come to rely on to make their database servers 'enterprise
worthy.' These features include advanced database storage, data
management tools, information replication, and tools to back it
up.

"During the past ten years, the open source community has
improved the quality of its software, making it more enterprise
worthy. As a result, enterprises have shown an interest in
migrating from proprietary, commercial software to open-source
software in recent years. For example, businesses around the world
commonly use Linux, the Perl programming language, the Apache Web
server, and the two leading open-source database engines,
PostgreSQL and MySQL..."